Hi, im still a relative newbie in this forum and on DIY instruments.
I am currently using two oscillators that my friend help me build.
As seen above, one is a Hex Schmitt trigger chip, and a NAND chip oscillator.

I want to make two more or another device plus my Roland TR626, which will all be powered by 9v. If I want to put them in one case, how do I make a simple and effective PSU for the 4 machines that are 9V.
I have built and bent simple objects before and can handle basic soldering so I can handle basic circuits for this.

Can anybody here recommend a simple way to do this?
Has anyone attempted the same project?

If it's just a DC 9V power supply you want, the easiest way is to grab a wall wart and solder the wires to a stripboard. Just create a bus.
There are plenty of designs for reducing any possible ripple in the signal if you want to get all hi-fi about it. But in my experience running several pedals off a bussed wall wart is a perfectly fine solution (in short, you're just making a daisy chain from a wall wart).
Building a power supply from scratch isn't really worth it (IMO) unless you need some sort of specialized supply, like a bipolar one.

also, if you want to filter the power supply but don't want to mess with wiring a transformer, couldn't you just build the filtering part of the Small Wart and solder the secondary of a wall wart to where the secondary of the transformer would go? Having a bit of extra filtering isn't going to hurt anything, right?

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